Unable to detect 2nd HP monitor connected on ASUS laptop

Hello everyone,

need help. My husband's ASUS laptop (with OS Windows 10) has connected a second monitor (an HP brand) using an HDMI cable and the laptop is not detecting it. We have done the basics -- restart laptop, unplug reconnect cables from 2nd monitor to laptop, used the same hdmi cable to another laptop and it worked. We checked the display settings and it isn't detecting it at all or even identofy it.